In the Caribbean Sea, near the Bahama Islands, a tourist swimmer finds the submerged body of a seaman who has disappeared from a destroyer of the US Navy. The victim wore dress whites and had an officer's sword (honed to a razor-sharp edge). Chained to the body were two weights of 25 pounds (11.36 kilos) each. Gibbs and company investigate aboard the ship and elsewhere. Abby tells them about a document indicating the seaman's participated in an MMPORG and she offers some insight about it. The team eventually identify aboard the ship a petty officer who is connected with the victim and the death; they also save the skipper from an explosion.
—DocRushing